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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.ui;
import com.android.gallery3d.common.Utils;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Canvas;
import android.graphics.Rect;
public class TileImageViewAdapter implements TileImageView.Model {
protected BitmapRegionDecoder mRegionDecoder;
protected int mImageWidth;
protected int mImageHeight;
protected Bitmap mBackupImage;
protected int mLevelCount;
protected boolean mFailedToLoad;
private final Rect mIntersectRect = new Rect();
private final Rect mRegionRect = new Rect();
public TileImageViewAdapter() {
}
public TileImageViewAdapter(Bitmap backup, BitmapRegionDecoder regionDecoder) {
mBackupImage = Utils.checkNotNull(backup);
mRegionDecoder = regionDecoder;
mImageWidth = regionDecoder.getWidth();
mImageHeight = regionDecoder.getHeight();
mLevelCount = calculateLevelCount();
}
public synchronized void clear() {
mBackupImage = null;
mImageWidth = 0;
mImageHeight = 0;
mLevelCount = 0;
mRegionDecoder = null;
mFailedToLoad = false;
}
public synchronized void setBackupImage(Bitmap backup, int width, int height) {
mBackupImage = Utils.checkNotNull(backup);
mImageWidth = width;
mImageHeight = height;
mRegionDecoder = null;
mLevelCount = 0;
mFailedToLoad = false;
}
public synchronized void setRegionDecoder(BitmapRegionDecoder decoder) {
mRegionDecoder = Utils.checkNotNull(decoder);
mImageWidth = decoder.getWidth();
mImageHeight = decoder.getHeight();
mLevelCount = calculateLevelCount();
mFailedToLoad = false;
}
private int calculateLevelCount() {
return Math.max(0, Utils.ceilLog2(
(float) mImageWidth / mBackupImage.getWidth()));
}
@Override
public synchronized Bitmap getTile(int level, int x, int y, int length) {
Rect region = mRegionRect;
Rect intersectRect = mIntersectRect;
region.set(x, y, x + (length << level), y + (length << level));
intersectRect.set(0, 0, mImageWidth, mImageHeight);
// Get the intersected rect of the requested region and the image.
Utils.assertTrue(intersectRect.intersect(region));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Config.ARGB_8888;
options.inPreferQualityOverSpeed = true;
options.inSampleSize = (1 << level);
Bitmap bitmap;
// In CropImage, we may call the decodeRegion() concurrently.
synchronized (mRegionDecoder) {
bitmap = mRegionDecoder.decodeRegion(intersectRect, options);
}
// The returned region may not match with the targetLength.
// If so, we fill black pixels on it.
if (intersectRect.equals(region)) return bitmap;
Bitmap tile = Bitmap.createBitmap(length, length, Config.ARGB_8888);
Canvas canvas = new Canvas(tile);
canvas.drawBitmap(bitmap,
(intersectRect.left - region.left) >> level,
(intersectRect.top - region.top) >> level, null);
bitmap.recycle();
return tile;
}
@Override
public Bitmap getBackupImage() {
return mBackupImage;
}
@Override
public int getImageHeight() {
return mImageHeight;
}
@Override
public int getImageWidth() {
return mImageWidth;
}
@Override
public int getLevelCount() {
return mLevelCount;
}
public void setFailedToLoad() {
mFailedToLoad = true;
}
@Override
public boolean isFailedToLoad() {
return mFailedToLoad;
}
}
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